2 years ago

What is the mass of 80.0 mL of ethanol at 20°C?

Chemistry

1 answer:

Dmitriy789 [7]2 years ago

4 0

The mass would be 63.1 grams

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opt. B

Explanation:

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2 years ago

Una muestra de 2,5000 (g) de piedra caliza, se disuelve y se precipita el Calcio como oxalato de Calcio (CaC2O4), este precipita

sergij07 [2.7K]

Answer:

$\%Ca=19.378\%$

Explanation:

¡Hola!

En este caso, basado en la información dada, es posible conocer la masa de calcio en carbonato de calcio, que de hecho es la misma en la muestra, al utilizar el siguiente esquema de cálculo:

$m_{Ca}=1,2093gCaCO_3*\frac{1molCaCO_3}{100.1gCaCO_3}*\frac{1molCa}{1molCaCO_3}*\frac{40.1gCa}{1molCa}\\\\m_{Ca}=0.48444gCa$

Finalmente, calculamos el porcentaje requerido como sigue:

$\% Ca=\frac{0.48444g}{2.5000g} *100\%\\\\\%Ca=19.378\%$

¡Saludos!

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2 years ago

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